Buthnot



smooth, and sized paper,

Niren STATES PATENT Orrica,

EMIL HOLTZMANN, OF SPEYER, GERMANY, ASSIGNOR TO IVILLIAM AR- BUTHNOT, OF LONDON, ENGLAND.

METHOD OF PRODUCING MULTIPLE-COPIES OF WRITINGS.

SPECIFICATION- formingpart of Letters Patent No. 227,629, dated May 18, 1880.

Application filed December 3, 1879. Patented in Germany April 30, 1878, in France May, 1878, in Belgium May 11, 1878, and in England May 13, 1878.

To all whom it may concern Be it known that I, EMIL Speyer, in the Empire of Germany, have i11- vented a certain new or Improved Method of Oopyin g or Reproducing Designs, Plans, Drawings, Writing, and the like, (and for which I have receiveda German patent, dated 30th April, 1878; French patent, No.124l,537, May, 1878 5 English patent, dated 13th May, and sealed 25th October, 187 8, and Belgian patent, dated May 11, 1878, No. 45,126, and issued May 31,1878,) of which the following is a specification.

This invention relates to improvements in the method of and means for reproducing designs, plans, drawings, writing, and the like "from one original sheet, and in one color or various colors, as desired, no special apparatus being required.

By the said invention a considerable number of copies may be taken from one sheet in a very short time and at a very small cost.

In carrying the said invention into practice I employ tracing-paper, colors especially prepared for my purpose, and negative-paper. The tracing-paper I prefer using is that which is prepared from paper treated with a mixture of oil and resin or other gum and afterward drying it. Ordinary drawing-paper will not serve for my purpose, as the fluid would render it adhesive to the negative-paper; but tracing-paper will serve in all cases, whether for the reproduction of old drawings or the like, or for new matter. The colors are dissolved aniline pigments in a highly-concentrated condition dissolved in Water. The negative-paper consists of ordinary strong, to which is applied quite athick layer of animal gelatine or glue.

The operation of taking the copies is as foll0ws--that is to say, the drawing, plan, Writing, or other matter to be copied or reproduced is first made upon the said tracingpaper with the said fluid color or colors. It is then placed with its face upon the gelatine layer or coating of said negative-paper, the latter having been previously placed in cold water, and allowed to remain therein until it HOLTZMANN, of-

wetted, placed upon the negative and pressed thereon by the hand. A copy is thus obtained, and in the same manner a great number of copies may be successively obtained from the same negative, the number obtainable depending upon the quantity of color used in the original drawing, plan, or writing.

I use paper known as satin paper for the copies.

As many as forty copies may very easily be taken.

The said invention is applicable to both large and small sheets.

I reserve for myself the right to take out a separate patent for the article or printingsurface described in the present application.

.I claim 1. The herein-described process of producing copies of plans, drawings, writings, and

the like in colors soluble in water, which consists in causing a surface or layer of glue or gelatine rendered uniformly moist and absorbent by soaking it in water to take up the colors from an original drawing or writing, so as to form the desired negative impression, and pressing the damped paper, on which the impression is to be reproduced in a positive form, upon the gelatine thus prepared, sub-- thereof on said gelatinous surface, then re- In testimony that I claim the foregoing I moving the original, and successively placing have hereunto set my hand this 3d (lay of a number of damped sheets of paper on November, 1879. said gelatinous surface, and transferring the EMIL HOLTZMANN.

5 moist impression to said sheets of paper by Witnesses:

applying hand or moderate pressure, substan- F. HASSLACHER,

tially as set forth. Jos. PATRICK. 

